Maddock lived and worked at Mount Macedon, Victoria until the Ash Wednesday fires of 1983 forced her to flee. Her house, studio and a large archive of the work of many decades was destroyed. She later returned to her native state of Tasmania. In 1987 she participated in the 'Artists in Antarctica' program with Jan Senbergs and John Caldwell. While on that voyage, she badly fractured her leg on Heard Island, which compromised her mobility for several years afterwards.

Her most recent major work, 'Terra Spiritus... With a Darker Shade of Pale', is a circumlittoral incised drawing in 51 parts of the entire coastline of Tasmania, each feature labelled with both the English and the aboriginal Tasmanian topographic names. The pigments used to make the drawing are made from native Tasmanian ochres.

Staff of the Queen Victoria Museum and Art Gallery in Launceston, Tasmania are currently preparing a catalogue raisonné. It will contain entries on 978 works produced by the artist between 1952 and 1983.